APC Smart UPS: USB or serial ???

tnt · Veteran Joined: 27 Feb 2004 Posts: 1222

I've bought the brand new APC Smart-UPS 750VA (SUA750I)

I've got both serial and USB cable to connect it to my computer. I'm going to use apcupsd to monitor/control the UPS - I had a really good experience with apcupsd with my old APC Back-UPS 500VA.

So, is there any difference in functionality/performance/reliability if I connect UPS via serial or USB cable?

:?:

_________________
gentoo user

likewhoa

not really, if you got a vacant serial port i say use that you can always use usb if you wish, either one is fine.

timeBandit · Posted: Tue Mar 13, 2007 3:57 am Post subject:

There is a difference, sometimes. Some UPS models only provide "dumb signaling" mode over the serial port, even with an APC cable: no data on battery reserve, line voltage quality and all that good stuff, just simple state transitions (on battery, on A/C, shutting down, etc.). Performance and reliability aren't affected, only the monitoring functionality.

That's true of the Back-UPS line anyway, but the Smart-UPS units are ... smarter

... and might work 100% over the serial link. Try both and see.
_________________
Plants are pithy, brooks tend to babble--I'm content to lie between them.
Super-short f.g.o checklist: Search first, strip comments, mark solved, help others.